Photosynthetica 2007, 45(1):65-69 | DOI: 10.1007/s11099-007-0010-8
Effect of chromium on photosystem 2 in the unicellular green alga, Chlorella pyrenoidosa
- 1 Department of Zoology, College of Nyíregyháza, Nyíregyháza, Hungary
- 2 Institute of Plant Biology, Biological Research Center, Hungarian Academy of Sciences, Szeged, Hungary
- 3 Department of Botany, Debrecen University, Debrecen, Hungary
We investigated the effect of chromium (20-40 g m-3, 8-72 h) on the photosystem 2 (PS2) activities of Chlorella pyrenoidosa cells. By using chlorophyll fluorescence transients, thermoluminescence, oxygen polarography, and Western blot analysis for D1 protein we found that inhibition of PS2 can be accounted for by the enhanced photodestruction of the reaction centres in the cells cultivated in the presence of Cr(VI) at 25 °C in "white light" (18 W m-2). Hence photodestruction of D1 is caused by an enhanced oxidative stress and lipid peroxidation, as indicated by the appearance of a high-temperature thermoluminescence band.
Additional key words: chlorophyll fluorescence; D1 protein; Western blot analysis; thermoluminescence
Received: May 9, 2006; Accepted: June 26, 2006; Published: March 1, 2007 Show citation
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